/* * BIRD Library -- Generic Buffer Structure * * (c) 2013 Ondrej Zajicek <santiago@crfreenet.org> * (c) 2013 CZ.NIC z.s.p.o. * * Can be freely distributed and used under the terms of the GNU GPL. */ #ifndef _BIRD_BUFFER_H_ #define _BIRD_BUFFER_H_ #include "lib/resource.h" #include "sysdep/config.h" #define BUFFER_(type) struct { type *data; uint used, size; } #define BUFFER_TYPE(v) typeof(* (v).data) #define BUFFER_SIZE(v) ((v).size * sizeof(* (v).data)) #ifndef PARSER #define BUFFER(type) BUFFER_(type) #endif #define BUFFER_INIT(v,pool,isize) \ ({ \ (v).used = 0; \ (v).size = (isize); \ (v).data = mb_alloc(pool, BUFFER_SIZE(v)); \ }) #define BUFFER_SET(v,nsize) \ ({ \ (v).used = (nsize); \ if ((v).used > (v).size) \ buffer_realloc((void **) &((v).data), &((v).size), (v).used, sizeof(* (v).data)); \ }) #define BUFFER_INC(v,step) \ ({ \ uint _o = (v).used; \ BUFFER_SET(v, (v).used + (step)); \ (v).data + _o; \ }) #define BUFFER_DEC(v,step) ({ (v).used -= (step); }) #define BUFFER_PUSH(v) (*BUFFER_INC(v,1)) #define BUFFER_POP(v) BUFFER_DEC(v,1) #define BUFFER_FLUSH(v) ({ (v).used = 0; }) #define BUFFER_EMPTY(v) ({ (v).used == 0; }) #define BUFFER_WALK(v,n) \ for (BUFFER_TYPE(v) *_n = (v).data, n; _n < ((v).data + (v).used) && (n = *_n, 1); _n++) #define BUFFER_SHALLOW_COPY(dst, src) \ ({ \ (dst).used = (src).used; \ (dst).size = (src).size; \ (dst).data = (src).data; \ }) #endif /* _BIRD_BUFFER_H_ */